A liquid-applied roof covering is specified on a small low-slope roof area. Which IBC minimum slope should be verified?
Correct Answer
D) 1/4 unit vertical in 12 units horizontal
IBC liquid-applied roof covering provisions use a 1/4:12 minimum slope. Other choices are steeper roof-covering values and do not match this low-slope membrane category.
Why This Is the Correct Answer
IBC liquid-applied roof covering provisions use a 1/4:12 minimum slope. Other choices are steeper roof-covering values and do not match this low-slope membrane category.
Why the Other Options Are Wrong
Option A: 1 unit vertical in 12 units horizontal
In thermal and moisture protection, 1 unit vertical in 12 units horizontal is the wrong selection for Liquid-applied roof slope: 1 unit vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Option B: Use 2 units vertical in 12 units horizontal as the liquid-applied roof slope threshold
The trap in B is 2 units vertical in 12 units horizontal. That selection is wrong because 2 units vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 4 units vertical in 12 units horizontal
Choice C gives 4 units vertical in 12 units horizontal. Its specific error: 4 units vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Link liquid-applied roof slope to its book condition; a different condition means a different answer than 1/4 unit vertical in 12 units horizontal.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 1507 liquid-applied roofing - slope to confirm that IBC liquid-applied roof covering provisions use a 1/4:12 minimum slope.
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